题干

人体内蛋白质的合成过程是基因表达的结果.如图中甲表示细胞内遗传信息的传递过程,乙为物质A的某一片段,丙为乙指导合成的C物质的片段.下列说法错误的是(  )

丙:﹣甲硫氨酸﹣脯氨酸﹣苏氨酸﹣甘氨酸﹣缬氨酸﹣

(可能用到的密码子:甲硫氨酸AUG,脯氨酸CCU,CCA,CCC,CCG,苏氨酸ACU,ACC,ACA,ACG,甘氨酸 GGU,GGA,GGG,GGC,缬氨酸 GUU,GUC,GUA,GUG)

A:若用含有15N标记的胸腺嘧啶脱氧核苷酸的培养基培养细菌,一段时间后,15N将会出现在甲图的A物质中

B:进行有性生殖的生物,亲子代间遗传信息的传递是通过甲图中①过程实现的,这一过程仅发生于细胞的有丝分裂间期

C:在根尖分生区细胞中,能发生①过程的细胞结构有细胞核、线粒体

D:丙是以乙的α链为模板指导合成的,最终使乙中的遗传信息体现在氨基酸排列顺序上

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答案(点此获取答案解析)

B

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配对阅读:左栏是5个中学生遇到的问题,右栏是某报社编辑提供的7个建议.请将这5个问题与其相对应的建议配对起来.其中有2项是多余的。

Students' problems

Suggestions from Editors

①I am not allowed to hang out with friends at all. My parents want me to study all the time at home. I feel unhappy. ____  

②I am too shy to speak in front of my classmates. They always laugh loudly when I am answering teachers' questions. I 'm frustrated. ____  

③My mother is a doctor. She is too busy with her work to spend the weekends with me. It seems that she doesn't care me at all. I feel lonely. ____  

④A senior high school student asks me to give him 100 yuan every week without telling others. I am frightened. So I don't want to go to school now. ____  

⑤I think I work harder than others but I get bad grades. Am I too stupid? ____  

A. Nobody is born-stupid. Maybe you haven't got right ways of study yet. Ask the teachers or classmates for help if you have any questions.

B. If you feel unhappy, go to have a good sleep and you will forget everything unhappy.

C. Don't be afraid. You should tell your parents or teachers at once. Don't go out alone then.

D. Your classmates may not laugh at you. If you don't like their laughter, you should talk to them about your feelings. They might understand you. And you had better be more easygoing and be their friend. You won't feel frustrated if your friends laugh.

E. Let your parents know your friends are nice. You learn a lot from them as well as having fun with them. You study with them outsides, too

F. Tell your mother you need her company sometimes. Also you could do some chores with your mother so she can finish her work quickly. Try to understand your mother and let her understand you, too.

G. You could invite your friends to play with you at home. It's fun to play in doors, too.